3-mercapto and 3-substituted mercapto-1, 3-dihydro-2h-1, 4-benzodiazepin-2-ones



United States Patent 3,296,251 3-MERCAPTO AND S-SUBSTITUTED MERCAPTO- 1,3-DIHYDRO-2H-1,4-BENZODIAZEPIN-2-ONES Stanley C. Bell, Philadelphia, Peter H. L. Wei, Upper Darby, and Carl Gochman, Philadelphia, Pa., assignors to American Home Products Corporation, New York, N.Y., a corporation of Delaware No Drawing. Filed Feb. 26, 1963, Ser. No. 261,229 4 Claims. (Cl. 260-2393) This invention is concerned with novel chemical compounds having useful pharmacodynarnic activity and with a process for making the same. The compounds of this invention are organic bases and their pharmaceutically acceptable acid salts.

More particularly, this invention relates to 3-mercapto and 3-substituted mercapto-1,3-dihydro-2H-1,4-benzodiazepin-Z-ones, which, as bases, are represented by the following formula:

R O X M; H

Y C==N wherein X and Y each represent hydrogen, chlorine, fluorine, nitro, methylsulfonyl, methoxy, methyl or trifluoromethyl; R is hydrogen, lower alkyl (methyl, ethyl, or propyl), lower alkenyl (allyl or methallyl) or lower ar-alkyl (benzyl or phenethyl): Ar is phenyl py-ridyl, furyl, thienyl or phenyl substituted by chlorine, fluorine, methoxy, methyl or trifluoromethyl and Z is a mercapto radical. In the above formula, Z may be an unsubstituted mercapto radical or a lower alkyl mercapto radical, a di(l-ower alkyl)aminoalkylmercapto radical, an aryl mercapto radical, an aralkyl mercapto radical, a heterocyclic alkyl mercapto radical such as 2-morpholinoethyl mercapto, 3-piperidinopropyl mercapto or 2-pyrrolidin-oethyl mercapto. The present invention also covers nontoxic acid salts of the above defined compounds With acids such as hydrochloric, sulfuric, phosphoric, maleic, succinic, fumaric and citric acids.

The starting compounds for this invention are 3-halo- 1,3-dihydro-5-phenyl-2H-1,4-benbodiazepin-2 0nes which are prepared as disclosed in co-pending application Ser. No. 177,174 filed March 5, 1962, and now abandoned.

These compounds have the following formula:

R O X I u I CHa1ogen wherein X, Y, R and Ar are as stated for Formula I.

A halogen atom at position 3 in compounds of Formula II is very active and accordingly these compounds react at room temperature with mercapto compounds such as thiourea, thioacetamide, KSH, NaSH and the like to produce compounds of Formula I. The reaction is preferably carried out in -a solvent, such as dimethoxy-et-hane or benzene.

The following examples in which all temperatures are in degrees centigrade illustrate the best mode of carrying out the present invention.

Patented Jan. 3, 1967 Example 1 To a solution of 3.0 g of 3,7-dichloro-l,3-dihydro-5- phenyl-ZH-1,4-benzodiazepin-2-one in 50 ml. of dimethoxy-ethane was added 3.0 g. of thiourea with stirring. After stirring for 1 hour, the reaction mixture was diluted with ml. of water, filtered from impurities, and made alkaline with sodium hydroxide. The solution was filtered from impurities, acidified with acetic acid and the product collected. Recrystallization from alcohol-water and then ethyl acetate-cyclohexane gave 7-chloro-l,3-dihydro 5-phenyl-3-mercapto-2H-1,4-benzodiazepin-2-one, M.P. 179-180.

Example 2 7 chloro-1,3-dihydro-5-phenyl-3-mercapto-2H-1,4-benzodiazepin-Z-one Was also prepared by substituting thioacetamide for thiourea in Example 1.

Example 3 To a mixture of 12.7 g. of diethylaminoethanethiol hydrochloride and 10.0 g. of triethylamine in benzene was gradually added with stirring and cooling 7.6 g. of 3,7- dichloro 1,3 -dihydro-5-phenyl-2H-1,4-benzodiazepin-2- one. After stirring for 3 hours, the reaction mixture was filtered from impurities, washed with water and evaporated in vacuo to dryness. The residue was washed with petroleum ether and converted to the hydrochloride salt in benzene. Recrystallization from ethanol gave 7-chloro- 3 (2 diethylaminoethylmercapto)-1,3-dihydro-5-phenyl- 2H-1,4-benzodiazepin-2-one hydrochloride, M.P. 260 dec.

When the following reactants are treated by the process steps of the foregoing examples, the corresponding products hereinafter disclosed are obtained:

Reactants Products 3,7-dichlor0-1,3dihydro-1-methyl- 5-(p-chloropheny1)-2H-1,4-benzodiazepine-Z-one and thiophenol.

7-chloro-1,3-dihydr0-1-methyl-3- pheny1mereapto-5-(p-ehlorophenyl)-2H-1,4-benzodiazepin- 2-one.

1-a11y1-3-benzylmercaptoJ-nitro-S- (2thienyl)'l,3-dihydro-2H-1,4- benzodiazepin-2-one.

l-benzyl-B-ethylmereaptomethyl-5-(m-fluorophenyl)-1,3- dihydro-ZH-l,4-benzodiazepm- 2-one.

3-(2-morpholinoethylmercapto)-5- (p-trifiuoromethylphenyl)-1,3- dihydro-ZH-l,4benzodiazepin- 2-one. 1,3-dihydroJ-methylsulfonyl-5- (p-methoxy'phenyD-3-(3-piperidinopropyl mercapto) -2H-1,4- benzodiazepin-2-one. 7,9-dichloro-l,3-dihydro-5-phenyl- 3-(2-pyrrolidinoethylmercapto)- 2H-1,4benzodiazepin-2-one.

7-chloro-3-(2-diethyl-aminoethylmercapto)-l,3-dihydro5-(2- pyridyl)-2H-1,4-benzodiazepin- 2-one.

7-chloro1,3-dihydro-3-(3dimethylaminopropylmercapto)--(2- fury1)-2H-1,4-benzodiazepm- 2-one.

The compounds of this invention have anti-convulsant, and potent anti-tremorine activities. They can be administered in a wide variety of oral or parenteral unit dosage forms, singly, or in admixture with other active compounds.

The present invention therefore also includes the process of bringing the compounds thereof into -a form suitable for therapeutic administration by associating them with liquid or solid, pharmaceutically acceptable carriers.

Various changes and modifications of this invention can be made by those skilled in the art to which it relates and to the extent that such variations incorporate the 'spirit of the invention, they are included in the scope of the claims.

What is claimed is:

1. A compound selected from the class consisting of 3- mercapto 1,3-dihydro-5-a-ryl-2H-1,4-benzodiazepin-2-one wherein aryl is selected from the group consisting of phenyl, pyridyl, furyl, thienyl, and phenyl substituted by chlorine, fluorine, methoxy, methyl, and tritiuoromcthyl and the pharmaceutically acceptable acid addition salts thereof.

2. A compound selected from the class consisting of 3- substituted mercapto-1,3-dihydro-5-aryl-2H-1,4-benzodi- .azepin-Z-ones wherein a-ryl is selected from the group consisting of phenyl, pyridyl, fury], thienyl, and phenyl substituted by chlorine, fluorine, methoxy, methyl, and trifiuoromethyl and in which the 3-substituent is selected from the group consisting of lower-alkylmercapto, di-

lower-alkylaniino-lower alkylmeroapto, phenylmercapto and benzylmercapto and the pharmaceutically acceptable acid addition salts thereof.

3. 7 chloro 1,3-dihydro-5-phenyl-3-mercapto-2H-1,4- benzodiazepin-Z-one.

4. 7-ch1oro-3-(2-diethylaminoethylmercapto)-1,3-dihydro-S-phenyl-ZH-l,4-benzodiazepin-2-one.

References Cited by the Examiner Bell et a1.: J. Org. Chem., vol. 27, pp. 1691-5 (1962).

Patent Journal, Republic of South Africa, vol. 1, page 30 (1961) For. Pat. 1R1.

Wagner et a1.: Synthetic Organic Chemistry (New York, 1953), pp. 787-788.

ALEX MAZEL, Primary Examiner.

NICHOLAS S. RIZZO, Examiner.

A. D. ROLLINS, Assistant Examiner. 

1. A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 3MERCAPTO - 1,3-DIHYDRO-5-ARYL-2H-1,4-BENZODIAPEPIN-2-ONE WHEREIN ARYL IS SELECTED FROM THE GROUP CONSISTING OF PHENYL, PYRIDYL, FURYL, THIENYL, AND PHENYL SUBSTITUTED BY CHLORINE, FLUORINE, METHOXY, METHYL, AND TRIFLUOROMETHYL AND THE PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALTS THEREOF.
 2. A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 3SUBSTITUTED - MERCAPTO-1,3-DIHYDRO-5-ARYL-2H-1,4-BENZODIAZEPIN-2-ONES WHEREIN ARYL IS SELECTED FROM THE GROUP CONSISTING OF PHENYL, PYRIDYL, FURYL, THIENYL, AND PHENYL SUBSTITUTED BY CHLORINE, FLUORINE, METHOXY, METHYL, AND TRIFLUOROMETHYL AND IN WHICH THE 3-SUBSTITUENT IS SELECTED FROM THE GROUP CONSISTING OF LOWER-ALKYLMERCAPTO, DILOWER-ALKYLAMINO-LOWER ALKYLMERCAPTO, PHENYLMERCAPTO AND BENZYLMERCAPTO AND THE PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALTS THEREOF. 